NAICS Code 335311 — Power, Distribution, and Specialty Transformer Manufacturing

National Industry in the official 2022 North American Industry Classification System (U.S. Census Bureau). It is one of 4 national industries under 33531 (Electrical Equipment Manufacturing).

Code	335311
Title	Power, Distribution, and Specialty Transformer Manufacturing
Level	National Industry (6-digit)
Edition	NAICS 2022 edition
SBA size standard	800 employees

Official definition (2022 NAICS)

This U.S. industry comprises establishments primarily engaged in manufacturing power, distribution, and specialty transformers (except electronic components). Industrial-type and consumer-type transformers in this industry vary (e.g., step up or step down) voltage but do not convert alternating to direct or direct to alternating current.

Illustrative Examples:

Fluorescent ballasts (i.e., transformers) manufacturing

Substation transformers, electric power distribution, manufacturing

Distribution transformers, electric, manufacturing

Transmission and distribution voltage regulators manufacturing

Cross-References.

Is a business under 335311 "small"?

Under the SBA size standards (13 CFR 121.201, effective March 17, 2023), a business classified in NAICS 335311 qualifies as a small business if it does not exceed 800 employees. Small-business status determines eligibility for federal set-aside contracts, SAM.gov certifications and SBA loan programs — employee count is averaged over the latest 24 months.

Where 335311 sits in the hierarchy

Level	Code	Title
Sector	31-33	Manufacturing
Subsector	335	Electrical Equipment, Appliance, and Component Manufacturing
Industry Group	3353	Electrical Equipment Manufacturing
NAICS Industry	33531	Electrical Equipment Manufacturing
National Industry	335311	Power, Distribution, and Specialty Transformer Manufacturing

Related SIC codes

Via the official U.S. Census concordance (1987 SIC ↔ NAICS), shown only where the industry definition is unchanged in NAICS 2022.

SIC code	Title
3548	Electric and Gas Welding and Soldering Equipment
3612	Power, Distribution, and Specialty Transformers

Related National Industry codes

• 335312 — Motor and Generator Manufacturing
• 335313 — Switchgear and Switchboard Apparatus Manufacturing
• 335314 — Relay and Industrial Control Manufacturing

Data: official 2022 NAICS structure, descriptions and Census concordances, U.S. Census Bureau — U.S. government works in the public domain (17 U.S.C. §105). Suggested reference, not an official determination.